First, the numbers:
FC maintained at 3 - 5 ppm
CYA = 30
ph ranges from 7.6 - 7.8
TA dropped from 100 to 80 over the past 4 weeks
The pool is being heavily aerated on a daily basis due to two German Shepherd dogs jumping in off the sides. They drag out large amounts of water and I refill approximately 2" every 3rd day.
Over the past several seasons I've kept the TA at 100 and the pH at 7.5 but with two dogs doing belly flops I'm having a terrible time maintaining those levels. I add some amount of HCl about once a week just to get the pH below 7.8 and that's not a problem. I mean, I'd rather not have to do that but will have to continue, I suppose.
Now the TA is dropping (why? from frequently refilling?) and to get it back to 100 I'll have to add baking soda and that, in turn, will raise the pH even more.
1. Should I drop the pH to below 7.5 before I add baking soda to raise the TA?
2. Given the unavoidable aeration will this cycle (high pH - low TA) continue or is there something I can do to stabilize it?
3. I have some wiggle room with the CYA. Would it help if I increased my presently very low trichlor usage?
I would truly appreciate your thoughts on this.